crypto/pcompress.c

   1 /*
   2  * Cryptographic API.
   3  *
   4  * Partial (de)compression operations.
   5  *
   6  * Copyright 2008 Sony Corporation
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; version 2 of the License.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.
  19  * If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include <linux/crypto.h>
  23 #include <linux/errno.h>
  24 #include <linux/module.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/string.h>
  27
  28 #include <crypto/compress.h>
  29
  30 #include "internal.h"
  31
  32
  33 static int crypto_pcomp_init(struct crypto_tfm *tfm, u32 type, u32 mask)
  34 {
  35         return 0;
  36 }
  37
  38 static unsigned int crypto_pcomp_extsize(struct crypto_alg *alg,
  39                                          const struct crypto_type *frontend)
  40 {
  41         return alg->cra_ctxsize;
  42 }
  43
  44 static int crypto_pcomp_init_tfm(struct crypto_tfm *tfm,
  45                                  const struct crypto_type *frontend)
  46 {
  47         return 0;
  48 }
  49
  50 static void crypto_pcomp_show(struct seq_file *m, struct crypto_alg *alg)
  51         __attribute__ ((unused));
  52 static void crypto_pcomp_show(struct seq_file *m, struct crypto_alg *alg)
  53 {
  54         seq_printf(m, "type         : pcomp\n");
  55 }
  56
  57 static const struct crypto_type crypto_pcomp_type = {
  58         .extsize        = crypto_pcomp_extsize,
  59         .init           = crypto_pcomp_init,
  60         .init_tfm       = crypto_pcomp_init_tfm,
  61 #ifdef CONFIG_PROC_FS
  62         .show           = crypto_pcomp_show,
  63 #endif
  64         .maskclear      = ~CRYPTO_ALG_TYPE_MASK,
  65         .maskset        = CRYPTO_ALG_TYPE_MASK,
  66         .type           = CRYPTO_ALG_TYPE_PCOMPRESS,
  67         .tfmsize        = offsetof(struct crypto_pcomp, base),
  68 };
  69
  70 struct crypto_pcomp *crypto_alloc_pcomp(const char *alg_name, u32 type,
  71                                         u32 mask)
  72 {
  73         return crypto_alloc_tfm(alg_name, &crypto_pcomp_type, type, mask);
  74 }
  75 EXPORT_SYMBOL_GPL(crypto_alloc_pcomp);
  76
  77 int crypto_register_pcomp(struct pcomp_alg *alg)
  78 {
  79         struct crypto_alg *base = &alg->base;
  80
  81         base->cra_type = &crypto_pcomp_type;
  82         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
  83         base->cra_flags |= CRYPTO_ALG_TYPE_PCOMPRESS;
  84
  85         return crypto_register_alg(base);
  86 }
  87 EXPORT_SYMBOL_GPL(crypto_register_pcomp);
  88
  89 int crypto_unregister_pcomp(struct pcomp_alg *alg)
  90 {
  91         return crypto_unregister_alg(&alg->base);
  92 }
  93 EXPORT_SYMBOL_GPL(crypto_unregister_pcomp);
  94
  95 MODULE_LICENSE("GPL");
  96 MODULE_DESCRIPTION("Partial (de)compression type");
  97 MODULE_AUTHOR("Sony Corporation");